There is a jellyfin community on lemmy, you can try to ask there: !jellyfin@lemmy.ml
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The Jellyfin community here is !jellyfin@lemmy.ml
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What you've got seems to be a truenas specific docker problem.
When you spin up Jellyfin docker, you normally specify a config volume and a data volume, so that as you upgrade, the users and watched lists etc are maintained.
You should be able to save those directories, delete the broken Jellyfin docker instance, and then recreate it pointing at the old volumes.
That way it would bind to the valid IP, but have the old configs and data.
At the command line I could help, but I don't know anything about Truenas sorry.